<?php

/**
 * @file
 * Administration functions for locale.module.
 */

/**
 * The language is determined using a URL language indicator:
 * path prefix or domain according to the configuration.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_URL', 'locale-url');

/**
 * The language is set based on the browser language settings.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_BROWSER', 'locale-browser');

/**
 * The language is determined using the current interface language.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_INTERFACE', 'locale-interface');

/**
 * If no URL language is available language is determined using an already
 * detected one.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_URL_FALLBACK', 'locale-url-fallback');

/**
 * The language is set based on the user language settings.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_USER', 'locale-user');

/**
 * The language is set based on the request/session parameters.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_SESSION', 'locale-session');

/**
 * Regular expression pattern used to localize JavaScript strings.
 */
define('LOCALE_JS_STRING', '(?:(?:\'(?:\\\\\'|[^\'])*\'|"(?:\\\\"|[^"])*")(?:\s*\+\s*)?)+');

/**
 * Regular expression pattern used to match simple JS object literal.
 *
 * This pattern matches a basic JS object, but will fail on an object with
 * nested objects. Used in JS file parsing for string arg processing.
 */
define('LOCALE_JS_OBJECT', '\{.*?\}');

/**
 * Regular expression to match an object containing a key 'context'.
 *
 * Pattern to match a JS object containing a 'context key' with a string value,
 * which is captured. Will fail if there are nested objects.
 */
define('LOCALE_JS_OBJECT_CONTEXT', '
		\{              # match object literal start
		.*?             # match anything, non-greedy
		(?:             # match a form of "context"
		\'context\'
		|
		"context"
		|
		context
)
		\s*:\s*         # match key-value separator ":"
		(' . LOCALE_JS_STRING . ')  # match context string
		.*?             # match anything, non-greedy
		\}              # match end of object literal
		');

/**
 * Translation import mode overwriting all existing translations
 * if new translated version available.
 */
define('LOCALE_IMPORT_OVERWRITE', 0);

/**
 * Translation import mode keeping existing translations and only
 * inserting new strings.
 */
define('LOCALE_IMPORT_KEEP', 1);

/**
 * URL language negotiation: use the path prefix as URL language
 * indicator.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX', 0);

/**
 * URL language negotiation: use the domain as URL language
 * indicator.
 */
define('LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN', 1);

/**
 * @defgroup locale-languages-negotiation Language negotiation options
 * @{
 * Functions for language negotiation.
 *
 * There are functions that provide the ability to identify the
 * language. This behavior can be controlled by various options.
 */

/**
 * Identifies the language from the current interface language.
 *
 * @return
 *   The current interface language code.
 */
function locale_language_from_interface() {
	global $language;
	return isset($language->language) ? $language->language : FALSE;
}

/**
 * Identify language from the Accept-language HTTP header we got.
 *
 * We perform browser accept-language parsing only if page cache is disabled,
 * otherwise we would cache a user-specific preference.
 *
 * @param $languages
 *   An array of language objects for enabled languages ordered by weight.
 *
 * @return
 *   A valid language code on success, FALSE otherwise.
 */
function locale_language_from_browser($languages) {
	if (empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
		return FALSE;
	}

	// The Accept-Language header contains information about the language
	// preferences configured in the user's browser / operating system.
	// RFC 2616 (section 14.4) defines the Accept-Language header as follows:
	//   Accept-Language = "Accept-Language" ":"
	//                  1#( language-range [ ";" "q" "=" qvalue ] )
	//   language-range  = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" )
	// Samples: "hu, en-us;q=0.66, en;q=0.33", "hu,en-us;q=0.5"
	$browser_langcodes = array();
	if (preg_match_all('@([a-zA-Z-]+|\*)(?:;q=([0-9.]+))?(?:$|\s*,\s*)@', trim($_SERVER['HTTP_ACCEPT_LANGUAGE']), $matches, PREG_SET_ORDER)) {
		foreach ($matches as $match) {
			// We can safely use strtolower() here, tags are ASCII.
			// RFC2616 mandates that the decimal part is no more than three digits,
			// so we multiply the qvalue by 1000 to avoid floating point comparisons.
			$langcode = strtolower($match[1]);
			$qvalue = isset($match[2]) ? (float) $match[2] : 1;
			$browser_langcodes[$langcode] = (int) ($qvalue * 1000);
		}
	}

	// We should take pristine values from the HTTP headers, but Internet Explorer
	// from version 7 sends only specific language tags (eg. fr-CA) without the
	// corresponding generic tag (fr) unless explicitly configured. In that case,
	// we assume that the lowest value of the specific tags is the value of the
	// generic language to be as close to the HTTP 1.1 spec as possible.
	// See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4 and
	// http://blogs.msdn.com/b/ie/archive/2006/10/17/accept-language-header-for-internet-explorer-7.aspx
	asort($browser_langcodes);
	foreach ($browser_langcodes as $langcode => $qvalue) {
		$generic_tag = strtok($langcode, '-');
		if (!isset($browser_langcodes[$generic_tag])) {
			$browser_langcodes[$generic_tag] = $qvalue;
		}
	}

	// Find the enabled language with the greatest qvalue, following the rules
	// of RFC 2616 (section 14.4). If several languages have the same qvalue,
	// prefer the one with the greatest weight.
	$best_match_langcode = FALSE;
	$max_qvalue = 0;
	foreach ($languages as $langcode => $language) {
		// Language tags are case insensitive (RFC2616, sec 3.10).
		$langcode = strtolower($langcode);

		// If nothing matches below, the default qvalue is the one of the wildcard
		// language, if set, or is 0 (which will never match).
		$qvalue = isset($browser_langcodes['*']) ? $browser_langcodes['*'] : 0;

		// Find the longest possible prefix of the browser-supplied language
		// ('the language-range') that matches this site language ('the language tag').
		$prefix = $langcode;
		do {
			if (isset($browser_langcodes[$prefix])) {
				$qvalue = $browser_langcodes[$prefix];
				break;
			}
		}
		while ($prefix = substr($prefix, 0, strrpos($prefix, '-')));

		// Find the best match.
		if ($qvalue > $max_qvalue) {
			$best_match_langcode = $language->language;
			$max_qvalue = $qvalue;
		}
	}

	return $best_match_langcode;
}

/**
 * Identify language from the user preferences.
 *
 * @param $languages
 *   An array of valid language objects.
 *
 * @return
 *   A valid language code on success, FALSE otherwise.
 */
function locale_language_from_user($languages) {
	// User preference (only for logged users).
	global $user;

	if ($user->uid) {
		return $user->language;
	}

	// No language preference from the user.
	return FALSE;
}

/**
 * Identify language from a request/session parameter.
 *
 * @param $languages
 *   An array of valid language objects.
 *
 * @return
 *   A valid language code on success, FALSE otherwise.
 */
function locale_language_from_session($languages) {
	$param = variable_get('locale_language_negotiation_session_param', 'language');

	// Request parameter: we need to update the session parameter only if we have
	// an authenticated user.
	if (isset($_GET[$param]) && isset($languages[$langcode = $_GET[$param]])) {
		global $user;
		if ($user->uid) {
			$_SESSION[$param] = $langcode;
		}
		return $langcode;
	}

	// Session parameter.
	if (isset($_SESSION[$param])) {
		return $_SESSION[$param];
	}

	return FALSE;
}

/**
 * Identify language via URL prefix or domain.
 *
 * @param $languages
 *   An array of valid language objects.
 *
 * @return
 *   A valid language code on success, FALSE otherwise.
 */
function locale_language_from_url($languages) {
	$language_url = FALSE;

	if (!language_negotiation_get_any(LOCALE_LANGUAGE_NEGOTIATION_URL)) {
		return $language_url;
	}

	switch (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX)) {
		case LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX:
			// $_GET['q'] might not be available at this time, because
			// path initialization runs after the language bootstrap phase.
			list($language, $_GET['q']) = language_url_split_prefix(isset($_GET['q']) ? $_GET['q'] : NULL, $languages);
			if ($language !== FALSE) {
				$language_url = $language->language;
			}
			break;

		case LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN:
			foreach ($languages as $language) {
				// Skip check if the language doesn't have a domain.
				if ($language->domain) {
					// Only compare the domains not the protocols or ports.
					// Remove protocol and add http:// so parse_url works
					$host = 'http://' . str_replace(array('http://', 'https://'), '', $language->domain);
					$host = parse_url($host, PHP_URL_HOST);
					if ($_SERVER['HTTP_HOST'] == $host) {
						$language_url = $language->language;
						break;
					}
				}
			}
			break;
	}

	return $language_url;
}

/**
 * Determines the language to be assigned to URLs when none is detected.
 *
 * The language negotiation process has a fallback chain that ends with the
 * default language provider. Each built-in language type has a separate
 * initialization:
 * - Interface language, which is the only configurable one, always gets a valid
 *   value. If no request-specific language is detected, the default language
 *   will be used.
 * - Content language merely inherits the interface language by default.
 * - URL language is detected from the requested URL and will be used to rewrite
 *   URLs appearing in the page being rendered. If no language can be detected,
 *   there are two possibilities:
 *   - If the default language has no configured path prefix or domain, then the
 *     default language is used. This guarantees that (missing) URL prefixes are
 *     preserved when navigating through the site.
 *   - If the default language has a configured path prefix or domain, a
 *     requested URL having an empty prefix or domain is an anomaly that must be
 *     fixed. This is done by introducing a prefix or domain in the rendered
 *     page matching the detected interface language.
 *
 * @param $languages
 *   (optional) An array of valid language objects. This is passed by
 *   language_provider_invoke() to every language provider callback, but it is
 *   not actually needed here. Defaults to NULL.
 * @param $language_type
 *   (optional) The language type to fall back to. Defaults to the interface
 *   language.
 *
 * @return
 *   A valid language code.
 */
function locale_language_url_fallback($language = NULL, $language_type = LANGUAGE_TYPE_INTERFACE) {
	$default = language_default();
	$prefix = (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX) == LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX);

	// If the default language is not configured to convey language information,
	// a missing URL language information indicates that URL language should be
	// the default one, otherwise we fall back to an already detected language.
	if (($prefix && empty($default->prefix)) || (!$prefix && empty($default->domain))) {
		return $default->language;
	}
	else {
		return $GLOBALS[$language_type]->language;
	}
}

/**
 * Return the URL language switcher block. Translation links may be provided by
 * other modules.
 */
function locale_language_switcher_url($type, $path) {
	$languages = language_list('enabled');
	$links = array();

	foreach ($languages[1] as $language) {
		$links[$language->language] = array(
				'href'       => $path,
				'title'      => $language->native,
				'language'   => $language,
				'attributes' => array('class' => array('language-link')),
		);
	}

	return $links;
}

/**
 * Return the session language switcher block.
 */
function locale_language_switcher_session($type, $path) {
	drupal_add_css(drupal_get_path('module', 'locale') . '/locale.css');

	$param = variable_get('locale_language_negotiation_session_param', 'language');
	$language_query = isset($_SESSION[$param]) ? $_SESSION[$param] : $GLOBALS[$type]->language;

	$languages = language_list('enabled');
	$links = array();

	$query = $_GET;
	unset($query['q']);

	foreach ($languages[1] as $language) {
		$langcode = $language->language;
		$links[$langcode] = array(
				'href'       => $path,
				'title'      => $language->native,
				'attributes' => array('class' => array('language-link')),
				'query'      => $query,
		);
		if ($language_query != $langcode) {
			$links[$langcode]['query'][$param] = $langcode;
		}
		else {
			$links[$langcode]['attributes']['class'][] = ' session-active';
		}
	}

	return $links;
}

/**
 * Rewrite URLs for the URL language provider.
 */
function locale_language_url_rewrite_url(&$path, &$options) {
	static $drupal_static_fast;
	if (!isset($drupal_static_fast)) {
		$drupal_static_fast['languages'] = &drupal_static(__FUNCTION__);
	}
	$languages = &$drupal_static_fast['languages'];

	if (!isset($languages)) {
		$languages = language_list('enabled');
		$languages = array_flip(array_keys($languages[1]));
	}

	// Language can be passed as an option, or we go for current URL language.
	if (!isset($options['language'])) {
		global $language_url;
		$options['language'] = $language_url;
	}
	// We allow only enabled languages here.
	elseif (!isset($languages[$options['language']->language])) {
		unset($options['language']);
		return;
	}

	if (isset($options['language'])) {
		switch (variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX)) {
			case LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN:
				if ($options['language']->domain) {
					// Ask for an absolute URL with our modified base_url.
					$options['absolute'] = TRUE;
					$options['base_url'] = $options['language']->domain;
				}
				break;

			case LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX:
				if (!empty($options['language']->prefix)) {
					$options['prefix'] = $options['language']->prefix . '/';
				}
				break;
		}
	}
}

/**
 * Rewrite URLs for the Session language provider.
 */
function locale_language_url_rewrite_session(&$path, &$options) {
	static $query_rewrite, $query_param, $query_value;

	// The following values are not supposed to change during a single page
	// request processing.
	if (!isset($query_rewrite)) {
		global $user;
		if (!$user->uid) {
			$languages = language_list('enabled');
			$languages = $languages[1];
			$query_param = check_plain(variable_get('locale_language_negotiation_session_param', 'language'));
			$query_value = isset($_GET[$query_param]) ? check_plain($_GET[$query_param]) : NULL;
			$query_rewrite = isset($languages[$query_value]) && language_negotiation_get_any(LOCALE_LANGUAGE_NEGOTIATION_SESSION);
		}
		else {
			$query_rewrite = FALSE;
		}
	}

	// If the user is anonymous, the user language provider is enabled, and the
	// corresponding option has been set, we must preserve any explicit user
	// language preference even with cookies disabled.
	if ($query_rewrite) {
		if (is_string($options['query'])) {
			$options['query'] = drupal_get_query_array($options['query']);
		}
		if (!isset($options['query'][$query_param])) {
			$options['query'][$query_param] = $query_value;
		}
	}
}

/**
 * @} End of "locale-languages-negotiation"
 */

/**
 * Check that a string is safe to be added or imported as a translation.
 *
 * This test can be used to detect possibly bad translation strings. It should
 * not have any false positives. But it is only a test, not a transformation,
 * as it destroys valid HTML. We cannot reliably filter translation strings
 * on import because some strings are irreversibly corrupted. For example,
 * a &amp; in the translation would get encoded to &amp;amp; by filter_xss()
 * before being put in the database, and thus would be displayed incorrectly.
 *
 * The allowed tag list is like filter_xss_admin(), but omitting div and img as
 * not needed for translation and likely to cause layout issues (div) or a
 * possible attack vector (img).
 */
function locale_string_is_safe($string) {
	return decode_entities($string) == decode_entities(filter_xss($string, array('a', 'abbr', 'acronym', 'address', 'b', 'bdo', 'big', 'blockquote', 'br', 'caption', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dl', 'dt', 'em', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'ins', 'kbd', 'li', 'ol', 'p', 'pre', 'q', 'samp', 'small', 'span', 'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'tt', 'ul', 'var')));
}

/**
 * @defgroup locale-api-add Language addition API
 * @{
 * Add a language.
 *
 * The language addition API is used to create languages and store them.
 */

/**
 * API function to add a language.
 *
 * @param $langcode
 *   Language code.
 * @param $name
 *   English name of the language
 * @param $native
 *   Native name of the language
 * @param $direction
 *   LANGUAGE_LTR or LANGUAGE_RTL
 * @param $domain
 *   Optional custom domain name with protocol, without
 *   trailing slash (eg. http://de.example.com).
 * @param $prefix
 *   Optional path prefix for the language. Defaults to the
 *   language code if omitted.
 * @param $enabled
 *   Optionally TRUE to enable the language when created or FALSE to disable.
 * @param $default
 *   Optionally set this language to be the default.
 */
function locale_add_language($langcode, $name = NULL, $native = NULL, $direction = LANGUAGE_LTR, $domain = '', $prefix = '', $enabled = TRUE, $default = FALSE) {
	// Default prefix on language code.
	if (empty($prefix)) {
		$prefix = $langcode;
	}

	// If name was not set, we add a predefined language.
	if (!isset($name)) {
		include_once DRUPAL_ROOT . '/includes/iso.inc';
		$predefined = _locale_get_predefined_list();
		$name = $predefined[$langcode][0];
		$native = isset($predefined[$langcode][1]) ? $predefined[$langcode][1] : $predefined[$langcode][0];
		$direction = isset($predefined[$langcode][2]) ? $predefined[$langcode][2] : LANGUAGE_LTR;
	}

	db_insert('languages')
	->fields(array(
			'language' => $langcode,
			'name' => $name,
			'native' => $native,
			'direction' => $direction,
			'domain' => $domain,
			'prefix' => $prefix,
			'enabled' => $enabled,
	))
	->execute();

	// Only set it as default if enabled.
	if ($enabled && $default) {
		variable_set('language_default', (object) array('language' => $langcode, 'name' => $name, 'native' => $native, 'direction' => $direction, 'enabled' => (int) $enabled, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => $prefix, 'weight' => 0, 'javascript' => ''));
	}

	if ($enabled) {
		// Increment enabled language count if we are adding an enabled language.
		variable_set('language_count', variable_get('language_count', 1) + 1);
	}

	// Kill the static cache in language_list().
	drupal_static_reset('language_list');

	// Force JavaScript translation file creation for the newly added language.
	_locale_invalidate_js($langcode);

	watchdog('locale', 'The %language language (%code) has been created.', array('%language' => $name, '%code' => $langcode));

	module_invoke_all('multilingual_settings_changed');
}
/**
 * @} End of "locale-api-add"
 */

/**
 * @defgroup locale-api-import-export Translation import/export API.
 * @{
 * Functions to import and export translations.
 *
 * These functions provide the ability to import translations from
 * external files and to export translations and translation templates.
 */

/**
 * Parses Gettext Portable Object file information and inserts into database
 *
 * @param $file
 *   Drupal file object corresponding to the PO file to import.
 * @param $langcode
 *   Language code.
 * @param $mode
 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or
 *   LOCALE_IMPORT_OVERWRITE.
 * @param $group
 *   Text group to import PO file into (eg. 'default' for interface
 *   translations).
 */
function _locale_import_po($file, $langcode, $mode, $group = NULL) {
	// Try to allocate enough time to parse and import the data.
	drupal_set_time_limit(240);

	// Check if we have the language already in the database.
	if (!db_query("SELECT COUNT(language) FROM {languages} WHERE language = :language", array(':language' => $langcode))->fetchField()) {
		drupal_set_message(t('The language selected for import is not supported.'), 'error');
		return FALSE;
	}

	// Get strings from file (returns on failure after a partial import, or on success)
	$status = _locale_import_read_po('db-store', $file, $mode, $langcode, $group);
	if ($status === FALSE) {
		// Error messages are set in _locale_import_read_po().
		return FALSE;
	}

	// Get status information on import process.
	list($header_done, $additions, $updates, $deletes, $skips) = _locale_import_one_string('db-report');

	if (!$header_done) {
		drupal_set_message(t('The translation file %filename appears to have a missing or malformed header.', array('%filename' => $file->filename)), 'error');
	}

	// Clear cache and force refresh of JavaScript translations.
	_locale_invalidate_js($langcode);
	cache_clear_all('locale:', 'cache', TRUE);

	// Rebuild the menu, strings may have changed.
	menu_rebuild();

	drupal_set_message(t('The translation was successfully imported. There are %number newly created translated strings, %update strings were updated and %delete strings were removed.', array('%number' => $additions, '%update' => $updates, '%delete' => $deletes)));
	watchdog('locale', 'Imported %file into %locale: %number new strings added, %update updated and %delete removed.', array('%file' => $file->filename, '%locale' => $langcode, '%number' => $additions, '%update' => $updates, '%delete' => $deletes));
	if ($skips) {
		$skip_message = format_plural($skips, 'One translation string was skipped because it contains disallowed HTML.', '@count translation strings were skipped because they contain disallowed HTML.');
		drupal_set_message($skip_message);
		watchdog('locale', '@count disallowed HTML string(s) in %file', array('@count' => $skips, '%file' => $file->uri), WATCHDOG_WARNING);
	}
	return TRUE;
}

/**
 * Parses Gettext Portable Object file into an array
 *
 * @param $op
 *   Storage operation type: db-store or mem-store.
 * @param $file
 *   Drupal file object corresponding to the PO file to import.
 * @param $mode
 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or
 *   LOCALE_IMPORT_OVERWRITE.
 * @param $lang
 *   Language code.
 * @param $group
 *   Text group to import PO file into (eg. 'default' for interface
 *   translations).
 */
function _locale_import_read_po($op, $file, $mode = NULL, $lang = NULL, $group = 'default') {

	// The file will get closed by PHP on returning from this function.
	$fd = fopen($file->uri, 'rb');
	if (!$fd) {
		_locale_import_message('The translation import failed, because the file %filename could not be read.', $file);
		return FALSE;
	}

	/*
	 * The parser context. Can be:
	*  - 'COMMENT' (#)
	*  - 'MSGID' (msgid)
	*  - 'MSGID_PLURAL' (msgid_plural)
	*  - 'MSGCTXT' (msgctxt)
	*  - 'MSGSTR' (msgstr or msgstr[])
	*  - 'MSGSTR_ARR' (msgstr_arg)
	*/
	$context = 'COMMENT';

	// Current entry being read.
	$current = array();

	// Current plurality for 'msgstr[]'.
	$plural = 0;

	// Current line.
	$lineno = 0;

	while (!feof($fd)) {
		// A line should not be longer than 10 * 1024.
		$line = fgets($fd, 10 * 1024);

		if ($lineno == 0) {
			// The first line might come with a UTF-8 BOM, which should be removed.
			$line = str_replace("\xEF\xBB\xBF", '', $line);
		}

		$lineno++;

		// Trim away the linefeed.
		$line = trim(strtr($line, array("\\\n" => "")));

		if (!strncmp('#', $line, 1)) {
			// Lines starting with '#' are comments.

			if ($context == 'COMMENT') {
				// Already in comment token, insert the comment.
				$current['#'][] = substr($line, 1);
			}
			elseif (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {
				// We are currently in string token, close it out.
				_locale_import_one_string($op, $current, $mode, $lang, $file, $group);

				// Start a new entry for the comment.
				$current         = array();
				$current['#'][]  = substr($line, 1);

				$context = 'COMMENT';
			}
			else {
				// A comment following any other token is a syntax error.
				_locale_import_message('The translation file %filename contains an error: "msgstr" was expected but not found on line %line.', $file, $lineno);
				return FALSE;
			}
		}
		elseif (!strncmp('msgid_plural', $line, 12)) {
			// A plural form for the current message.

			if ($context != 'MSGID') {
				// A plural form cannot be added to anything else but the id directly.
				_locale_import_message('The translation file %filename contains an error: "msgid_plural" was expected but not found on line %line.', $file, $lineno);
				return FALSE;
			}

			// Remove 'msgid_plural' and trim away whitespace.
			$line = trim(substr($line, 12));
			// At this point, $line should now contain only the plural form.

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The plural form must be wrapped in quotes.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			// Append the plural form to the current entry.
			$current['msgid'] .= "\0" . $quoted;

			$context = 'MSGID_PLURAL';
		}
		elseif (!strncmp('msgid', $line, 5)) {
			// Starting a new message.

			if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {
				// We are currently in a message string, close it out.
				_locale_import_one_string($op, $current, $mode, $lang, $file, $group);

				// Start a new context for the id.
				$current = array();
			}
			elseif ($context == 'MSGID') {
				// We are currently already in the context, meaning we passed an id with no data.
				_locale_import_message('The translation file %filename contains an error: "msgid" is unexpected on line %line.', $file, $lineno);
				return FALSE;
			}

			// Remove 'msgid' and trim away whitespace.
			$line = trim(substr($line, 5));
			// At this point, $line should now contain only the message id.

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The message id must be wrapped in quotes.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			$current['msgid'] = $quoted;
			$context = 'MSGID';
		}
		elseif (!strncmp('msgctxt', $line, 7)) {
			// Starting a new context.

			if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {
				// We are currently in a message, start a new one.
				_locale_import_one_string($op, $current, $mode, $lang, $file, $group);
				$current = array();
			}
			elseif (!empty($current['msgctxt'])) {
				// A context cannot apply to another context.
				_locale_import_message('The translation file %filename contains an error: "msgctxt" is unexpected on line %line.', $file, $lineno);
				return FALSE;
			}

			// Remove 'msgctxt' and trim away whitespaces.
			$line = trim(substr($line, 7));
			// At this point, $line should now contain the context.

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The context string must be quoted.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			$current['msgctxt'] = $quoted;

			$context = 'MSGCTXT';
		}
		elseif (!strncmp('msgstr[', $line, 7)) {
			// A message string for a specific plurality.

			if (($context != 'MSGID') && ($context != 'MSGCTXT') && ($context != 'MSGID_PLURAL') && ($context != 'MSGSTR_ARR')) {
				// Message strings must come after msgid, msgxtxt, msgid_plural, or other msgstr[] entries.
				_locale_import_message('The translation file %filename contains an error: "msgstr[]" is unexpected on line %line.', $file, $lineno);
				return FALSE;
			}

			// Ensure the plurality is terminated.
			if (strpos($line, ']') === FALSE) {
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			// Extract the plurality.
			$frombracket = strstr($line, '[');
			$plural = substr($frombracket, 1, strpos($frombracket, ']') - 1);

			// Skip to the next whitespace and trim away any further whitespace, bringing $line to the message data.
			$line = trim(strstr($line, " "));

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The string must be quoted.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			$current['msgstr'][$plural] = $quoted;

			$context = 'MSGSTR_ARR';
		}
		elseif (!strncmp("msgstr", $line, 6)) {
			// A string for the an id or context.

			if (($context != 'MSGID') && ($context != 'MSGCTXT')) {
				// Strings are only valid within an id or context scope.
				_locale_import_message('The translation file %filename contains an error: "msgstr" is unexpected on line %line.', $file, $lineno);
				return FALSE;
			}

			// Remove 'msgstr' and trim away away whitespaces.
			$line = trim(substr($line, 6));
			// At this point, $line should now contain the message.

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The string must be quoted.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			$current['msgstr'] = $quoted;

			$context = 'MSGSTR';
		}
		elseif ($line != '') {
			// Anything that is not a token may be a continuation of a previous token.

			$quoted = _locale_import_parse_quoted($line);
			if ($quoted === FALSE) {
				// The string must be quoted.
				_locale_import_message('The translation file %filename contains a syntax error on line %line.', $file, $lineno);
				return FALSE;
			}

			// Append the string to the current context.
			if (($context == 'MSGID') || ($context == 'MSGID_PLURAL')) {
				$current['msgid'] .= $quoted;
			}
			elseif ($context == 'MSGCTXT') {
				$current['msgctxt'] .= $quoted;
			}
			elseif ($context == 'MSGSTR') {
				$current['msgstr'] .= $quoted;
			}
			elseif ($context == 'MSGSTR_ARR') {
				$current['msgstr'][$plural] .= $quoted;
			}
			else {
				// No valid context to append to.
				_locale_import_message('The translation file %filename contains an error: there is an unexpected string on line %line.', $file, $lineno);
				return FALSE;
			}
		}
	}

	// End of PO file, closed out the last entry.
	if (($context == 'MSGSTR') || ($context == 'MSGSTR_ARR')) {
		_locale_import_one_string($op, $current, $mode, $lang, $file, $group);
	}
	elseif ($context != 'COMMENT') {
		_locale_import_message('The translation file %filename ended unexpectedly at line %line.', $file, $lineno);
		return FALSE;
	}
}

/**
 * Sets an error message occurred during locale file parsing.
 *
 * @param $message
 *   The message to be translated.
 * @param $file
 *   Drupal file object corresponding to the PO file to import.
 * @param $lineno
 *   An optional line number argument.
 */
function _locale_import_message($message, $file, $lineno = NULL) {
	$vars = array('%filename' => $file->filename);
	if (isset($lineno)) {
		$vars['%line'] = $lineno;
	}
	$t = get_t();
	drupal_set_message($t($message, $vars), 'error');
}

/**
 * Imports a string into the database
 *
 * @param $op
 *   Operation to perform: 'db-store', 'db-report', 'mem-store' or 'mem-report'.
 * @param $value
 *   Details of the string stored.
 * @param $mode
 *   Should existing translations be replaced LOCALE_IMPORT_KEEP or
 *   LOCALE_IMPORT_OVERWRITE.
 * @param $lang
 *   Language to store the string in.
 * @param $file
 *   Object representation of file being imported, only required when op is
 *   'db-store'.
 * @param $group
 *   Text group to import PO file into (eg. 'default' for interface
 *   translations).
 */
function _locale_import_one_string($op, $value = NULL, $mode = NULL, $lang = NULL, $file = NULL, $group = 'default') {
	$report = &drupal_static(__FUNCTION__, array('additions' => 0, 'updates' => 0, 'deletes' => 0, 'skips' => 0));
	$header_done = &drupal_static(__FUNCTION__ . ':header_done', FALSE);
	$strings = &drupal_static(__FUNCTION__ . ':strings', array());

	switch ($op) {
		// Return stored strings
		case 'mem-report':
			return $strings;

			// Store string in memory (only supports single strings)
		case 'mem-store':
			$strings[isset($value['msgctxt']) ? $value['msgctxt'] : ''][$value['msgid']] = $value['msgstr'];
			return;

			// Called at end of import to inform the user
		case 'db-report':
			return array($header_done, $report['additions'], $report['updates'], $report['deletes'], $report['skips']);

			// Store the string we got in the database.
		case 'db-store':
			// We got header information.
			if ($value['msgid'] == '') {
				$languages = language_list();
				if (($mode != LOCALE_IMPORT_KEEP) || empty($languages[$lang]->plurals)) {
					// Since we only need to parse the header if we ought to update the
					// plural formula, only run this if we don't need to keep existing
					// data untouched or if we don't have an existing plural formula.
					$header = _locale_import_parse_header($value['msgstr']);

					// Get the plural formula and update in database.
					if (isset($header["Plural-Forms"]) && $p = _locale_import_parse_plural_forms($header["Plural-Forms"], $file->uri)) {
						list($nplurals, $plural) = $p;
						db_update('languages')
						->fields(array(
								'plurals' => $nplurals,
								'formula' => $plural,
						))
						->condition('language', $lang)
						->execute();
					}
					else {
						db_update('languages')
						->fields(array(
								'plurals' => 0,
								'formula' => '',
						))
						->condition('language', $lang)
						->execute();
					}
				}
				$header_done = TRUE;
			}

			else {
				// Some real string to import.
				$comments = _locale_import_shorten_comments(empty($value['#']) ? array() : $value['#']);

				if (strpos($value['msgid'], "\0")) {
					// This string has plural versions.
					$english = explode("\0", $value['msgid'], 2);
					$entries = array_keys($value['msgstr']);
					for ($i = 3; $i <= count($entries); $i++) {
						$english[] = $english[1];
					}
					$translation = array_map('_locale_import_append_plural', $value['msgstr'], $entries);
					$english = array_map('_locale_import_append_plural', $english, $entries);
					foreach ($translation as $key => $trans) {
						if ($key == 0) {
							$plid = 0;
						}
						$plid = _locale_import_one_string_db($report, $lang, isset($value['msgctxt']) ? $value['msgctxt'] : '', $english[$key], $trans, $group, $comments, $mode, $plid, $key);
					}
				}

				else {
					// A simple string to import.
					$english = $value['msgid'];
					$translation = $value['msgstr'];
					_locale_import_one_string_db($report, $lang, isset($value['msgctxt']) ? $value['msgctxt'] : '', $english, $translation, $group, $comments, $mode);
				}
			}
	} // end of db-store operation
}

/**
 * Import one string into the database.
 *
 * @param $report
 *   Report array summarizing the number of changes done in the form:
 *   array(inserts, updates, deletes).
 * @param $langcode
 *   Language code to import string into.
 * @param $context
 *   The context of this string.
 * @param $source
 *   Source string.
 * @param $translation
 *   Translation to language specified in $langcode.
 * @param $textgroup
 *   Name of textgroup to store translation in.
 * @param $location
 *   Location value to save with source string.
 * @param $mode
 *   Import mode to use, LOCALE_IMPORT_KEEP or LOCALE_IMPORT_OVERWRITE.
 * @param $plid
 *   Optional plural ID to use.
 * @param $plural
 *   Optional plural value to use.
 *
 * @return
 *   The string ID of the existing string modified or the new string added.
 */
function _locale_import_one_string_db(&$report, $langcode, $context, $source, $translation, $textgroup, $location, $mode, $plid = 0, $plural = 0) {
	$lid = db_query("SELECT lid FROM {locales_source} WHERE source = :source AND context = :context AND textgroup = :textgroup", array(':source' => $source, ':context' => $context, ':textgroup' => $textgroup))->fetchField();

	if (!empty($translation)) {
		// Skip this string unless it passes a check for dangerous code.
		// Text groups other than default still can contain HTML tags
		// (i.e. translatable blocks).
		if ($textgroup == "default" && !locale_string_is_safe($translation)) {
			$report['skips']++;
			$lid = 0;
		}
		elseif ($lid) {
			// We have this source string saved already.
			db_update('locales_source')
			->fields(array(
					'location' => $location,
			))
			->condition('lid', $lid)
			->execute();

			$exists = db_query("SELECT COUNT(lid) FROM {locales_target} WHERE lid = :lid AND language = :language", array(':lid' => $lid, ':language' => $langcode))->fetchField();

			if (!$exists) {
				// No translation in this language.
				db_insert('locales_target')
				->fields(array(
						'lid' => $lid,
						'language' => $langcode,
						'translation' => $translation,
						'plid' => $plid,
						'plural' => $plural,
				))
				->execute();

				$report['additions']++;
			}
			elseif ($mode == LOCALE_IMPORT_OVERWRITE) {
				// Translation exists, only overwrite if instructed.
				db_update('locales_target')
				->fields(array(
						'translation' => $translation,
						'plid' => $plid,
						'plural' => $plural,
				))
				->condition('language', $langcode)
				->condition('lid', $lid)
				->execute();

				$report['updates']++;
			}
		}
		else {
			// No such source string in the database yet.
			$lid = db_insert('locales_source')
			->fields(array(
					'location' => $location,
					'source' => $source,
					'context' => (string) $context,
					'textgroup' => $textgroup,
			))
			->execute();

			db_insert('locales_target')
			->fields(array(
					'lid' => $lid,
					'language' => $langcode,
					'translation' => $translation,
					'plid' => $plid,
					'plural' => $plural
			))
			->execute();

			$report['additions']++;
		}
	}
	elseif ($mode == LOCALE_IMPORT_OVERWRITE) {
		// Empty translation, remove existing if instructed.
		db_delete('locales_target')
		->condition('language', $langcode)
		->condition('lid', $lid)
		->condition('plid', $plid)
		->condition('plural', $plural)
		->execute();

		$report['deletes']++;
	}

	return $lid;
}

/**
 * Parses a Gettext Portable Object file header
 *
 * @param $header
 *   A string containing the complete header.
 *
 * @return
 *   An associative array of key-value pairs.
 */
function _locale_import_parse_header($header) {
	$header_parsed = array();
	$lines = array_map('trim', explode("\n", $header));
	foreach ($lines as $line) {
		if ($line) {
			list($tag, $contents) = explode(":", $line, 2);
			$header_parsed[trim($tag)] = trim($contents);
		}
	}
	return $header_parsed;
}

/**
 * Parses a Plural-Forms entry from a Gettext Portable Object file header
 *
 * @param $pluralforms
 *   A string containing the Plural-Forms entry.
 * @param $filepath
 *   A string containing the filepath.
 *
 * @return
 *   An array containing the number of plurals and a
 *   formula in PHP for computing the plural form.
 */
function _locale_import_parse_plural_forms($pluralforms, $filepath) {
	// First, delete all whitespace
	$pluralforms = strtr($pluralforms, array(" " => "", "\t" => ""));

	// Select the parts that define nplurals and plural
	$nplurals = strstr($pluralforms, "nplurals=");
	if (strpos($nplurals, ";")) {
		$nplurals = substr($nplurals, 9, strpos($nplurals, ";") - 9);
	}
	else {
		return FALSE;
	}
	$plural = strstr($pluralforms, "plural=");
	if (strpos($plural, ";")) {
		$plural = substr($plural, 7, strpos($plural, ";") - 7);
	}
	else {
		return FALSE;
	}

	// Get PHP version of the plural formula
	$plural = _locale_import_parse_arithmetic($plural);

	if ($plural !== FALSE) {
		return array($nplurals, $plural);
	}
	else {
		drupal_set_message(t('The translation file %filepath contains an error: the plural formula could not be parsed.', array('%filepath' => $filepath)), 'error');
		return FALSE;
	}
}

/**
 * Parses and sanitizes an arithmetic formula into a PHP expression
 *
 * While parsing, we ensure, that the operators have the right
 * precedence and associativity.
 *
 * @param $string
 *   A string containing the arithmetic formula.
 *
 * @return
 *   The PHP version of the formula.
 */
function _locale_import_parse_arithmetic($string) {
	// Operator precedence table
	$precedence = array("(" => -1, ")" => -1, "?" => 1, ":" => 1, "||" => 3, "&&" => 4, "==" => 5, "!=" => 5, "<" => 6, ">" => 6, "<=" => 6, ">=" => 6, "+" => 7, "-" => 7, "*" => 8, "/" => 8, "%" => 8);
	// Right associativity
	$right_associativity = array("?" => 1, ":" => 1);

	$tokens = _locale_import_tokenize_formula($string);

	// Parse by converting into infix notation then back into postfix
	// Operator stack - holds math operators and symbols
	$operator_stack = array();
	// Element Stack - holds data to be operated on
	$element_stack = array();

	foreach ($tokens as $token) {
		$current_token = $token;

		// Numbers and the $n variable are simply pushed into $element_stack
		if (is_numeric($token)) {
			$element_stack[] = $current_token;
		}
		elseif ($current_token == "n") {
			$element_stack[] = '$n';
		}
		elseif ($current_token == "(") {
			$operator_stack[] = $current_token;
		}
		elseif ($current_token == ")") {
			$topop = array_pop($operator_stack);
			while (isset($topop) && ($topop != "(")) {
				$element_stack[] = $topop;
				$topop = array_pop($operator_stack);
			}
		}
		elseif (!empty($precedence[$current_token])) {
			// If it's an operator, then pop from $operator_stack into $element_stack until the
			// precedence in $operator_stack is less than current, then push into $operator_stack
			$topop = array_pop($operator_stack);
			while (isset($topop) && ($precedence[$topop] >= $precedence[$current_token]) && !(($precedence[$topop] == $precedence[$current_token]) && !empty($right_associativity[$topop]) && !empty($right_associativity[$current_token]))) {
				$element_stack[] = $topop;
				$topop = array_pop($operator_stack);
			}
			if ($topop) {
				$operator_stack[] = $topop;   // Return element to top
			}
			$operator_stack[] = $current_token;      // Parentheses are not needed
		}
		else {
			return FALSE;
		}
	}

	// Flush operator stack
	$topop = array_pop($operator_stack);
	while ($topop != NULL) {
		$element_stack[] = $topop;
		$topop = array_pop($operator_stack);
	}

	// Now extract formula from stack
	$previous_size = count($element_stack) + 1;
	while (count($element_stack) < $previous_size) {
		$previous_size = count($element_stack);
		for ($i = 2; $i < count($element_stack); $i++) {
			$op = $element_stack[$i];
			if (!empty($precedence[$op])) {
				$f = "";
				if ($op == ":") {
					$f = $element_stack[$i - 2] . "):" . $element_stack[$i - 1] . ")";
				}
				elseif ($op == "?") {
					$f = "(" . $element_stack[$i - 2] . "?(" . $element_stack[$i - 1];
				}
				else {
					$f = "(" . $element_stack[$i - 2] . $op . $element_stack[$i - 1] . ")";
				}
				array_splice($element_stack, $i - 2, 3, $f);
				break;
			}
		}
	}

	// If only one element is left, the number of operators is appropriate
	if (count($element_stack) == 1) {
		return $element_stack[0];
	}
	else {
		return FALSE;
	}
}

/**
 * Backward compatible implementation of token_get_all() for formula parsing
 *
 * @param $string
 *   A string containing the arithmetic formula.
 *
 * @return
 *   The PHP version of the formula.
 */
function _locale_import_tokenize_formula($formula) {
	$formula = str_replace(" ", "", $formula);
	$tokens = array();
	for ($i = 0; $i < strlen($formula); $i++) {
		if (is_numeric($formula[$i])) {
			$num = $formula[$i];
			$j = $i + 1;
			while ($j < strlen($formula) && is_numeric($formula[$j])) {
				$num .= $formula[$j];
				$j++;
			}
			$i = $j - 1;
			$tokens[] = $num;
		}
		elseif ($pos = strpos(" =<>!&|", $formula[$i])) { // We won't have a space
			$next = $formula[$i + 1];
			switch ($pos) {
				case 1:
				case 2:
				case 3:
				case 4:
					if ($next == '=') {
						$tokens[] = $formula[$i] . '=';
						$i++;
					}
					else {
						$tokens[] = $formula[$i];
					}
					break;
				case 5:
					if ($next == '&') {
						$tokens[] = '&&';
						$i++;
					}
					else {
						$tokens[] = $formula[$i];
					}
					break;
				case 6:
					if ($next == '|') {
						$tokens[] = '||';
						$i++;
					}
					else {
						$tokens[] = $formula[$i];
					}
					break;
			}
		}
		else {
			$tokens[] = $formula[$i];
		}
	}
	return $tokens;
}

/**
 * Modify a string to contain proper count indices
 *
 * This is a callback function used via array_map()
 *
 * @param $entry
 *   An array element.
 * @param $key
 *   Index of the array element.
 */
function _locale_import_append_plural($entry, $key) {
	// No modifications for 0, 1
	if ($key == 0 || $key == 1) {
		return $entry;
	}

	// First remove any possibly false indices, then add new ones
	$entry = preg_replace('/(@count)\[[0-9]\]/', '\\1', $entry);
	return preg_replace('/(@count)/', "\\1[$key]", $entry);
}

/**
 * Generate a short, one string version of the passed comment array
 *
 * @param $comment
 *   An array of strings containing a comment.
 *
 * @return
 *   Short one string version of the comment.
 */
function _locale_import_shorten_comments($comment) {
	$comm = '';
	while (count($comment)) {
		$test = $comm . substr(array_shift($comment), 1) . ', ';
		if (strlen($comm) < 130) {
			$comm = $test;
		}
		else {
			break;
		}
	}
	return trim(substr($comm, 0, -2));
}

/**
 * Parses a string in quotes
 *
 * @param $string
 *   A string specified with enclosing quotes.
 *
 * @return
 *   The string parsed from inside the quotes.
 */
function _locale_import_parse_quoted($string) {
	if (substr($string, 0, 1) != substr($string, -1, 1)) {
		return FALSE;   // Start and end quotes must be the same
	}
	$quote = substr($string, 0, 1);
	$string = substr($string, 1, -1);
	if ($quote == '"') {        // Double quotes: strip slashes
		return stripcslashes($string);
	}
	elseif ($quote == "'") {  // Simple quote: return as-is
		return $string;
	}
	else {
		return FALSE;             // Unrecognized quote
	}
}
/**
 * @} End of "locale-api-import-export"
 */

/**
 * Parses a JavaScript file, extracts strings wrapped in Drupal.t() and
 * Drupal.formatPlural() and inserts them into the database.
 */
function _locale_parse_js_file($filepath) {
	global $language;

	// The file path might contain a query string, so make sure we only use the
	// actual file.
	$parsed_url = drupal_parse_url($filepath);
	$filepath = $parsed_url['path'];
	// Load the JavaScript file.
	$file = file_get_contents($filepath);

	// Match all calls to Drupal.t() in an array.
	// Note: \s also matches newlines with the 's' modifier.
	preg_match_all('~
			[^\w]Drupal\s*\.\s*t\s*                       # match "Drupal.t" with whitespace
			\(\s*                                         # match "(" argument list start
			(' . LOCALE_JS_STRING . ')\s*                 # capture string argument
			(?:,\s*' . LOCALE_JS_OBJECT . '\s*            # optionally capture str args
			(?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*) # optionally capture context
			?)?                                           # close optional args
			[,\)]                                         # match ")" or "," to finish
			~sx', $file, $t_matches);

	// Match all Drupal.formatPlural() calls in another array.
	preg_match_all('~
			[^\w]Drupal\s*\.\s*formatPlural\s*  # match "Drupal.formatPlural" with whitespace
			\(                                  # match "(" argument list start
			\s*.+?\s*,\s*                       # match count argument
			(' . LOCALE_JS_STRING . ')\s*,\s*   # match singular string argument
			(                             # capture plural string argument
			(?:                         # non-capturing group to repeat string pieces
			(?:
			\'                      # match start of single-quoted string
			(?:\\\\\'|[^\'])*       # match any character except unescaped single-quote
			@count                  # match "@count"
			(?:\\\\\'|[^\'])*       # match any character except unescaped single-quote
			\'                      # match end of single-quoted string
			|
			"                       # match start of double-quoted string
			(?:\\\\"|[^"])*         # match any character except unescaped double-quote
			@count                  # match "@count"
			(?:\\\\"|[^"])*         # match any character except unescaped double-quote
			"                       # match end of double-quoted string
	)
			(?:\s*\+\s*)?             # match "+" with possible whitespace, for str concat
	)+                          # match multiple because we supports concatenating strs
	)\s*                          # end capturing of plural string argument
			(?:,\s*' . LOCALE_JS_OBJECT . '\s*          # optionally capture string args
			(?:,\s*' . LOCALE_JS_OBJECT_CONTEXT . '\s*)?  # optionally capture context
	)?
			[,\)]
			~sx', $file, $plural_matches);

	$matches = array();

	// Add strings from Drupal.t().
	foreach ($t_matches[1] as $key => $string) {
		$matches[] = array(
				'string'  => $string,
				'context' => $t_matches[2][$key],
		);
	}

	// Add string from Drupal.formatPlural().
	foreach ($plural_matches[1] as $key => $string) {
		$matches[] = array(
				'string'  => $string,
				'context' => $plural_matches[3][$key],
		);

		// If there is also a plural version of this string, add it to the strings array.
		if (isset($plural_matches[2][$key])) {
			$matches[] = array(
					'string'  => $plural_matches[2][$key],
					'context' => $plural_matches[3][$key],
			);
		}
	}

	foreach ($matches as $key => $match) {
		// Remove the quotes and string concatenations from the string.
		$string = implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($match['string'], 1, -1)));
		$context = implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($match['context'], 1, -1)));

		$source = db_query("SELECT lid, location FROM {locales_source} WHERE source = :source AND context = :context AND textgroup = 'default'", array(':source' => $string, ':context' => $context))->fetchObject();
		if ($source) {
			// We already have this source string and now have to add the location
			// to the location column, if this file is not yet present in there.
			$locations = preg_split('~\s*;\s*~', $source->location);

			if (!in_array($filepath, $locations)) {
				$locations[] = $filepath;
				$locations = implode('; ', $locations);

				// Save the new locations string to the database.
				db_update('locales_source')
				->fields(array(
						'location' => $locations,
				))
				->condition('lid', $source->lid)
				->execute();
			}
		}
		else {
			// We don't have the source string yet, thus we insert it into the database.
			db_insert('locales_source')
			->fields(array(
					'location' => $filepath,
					'source' => $string,
					'context' => $context,
					'textgroup' => 'default',
			))
			->execute();
		}
	}
}

/**
 * @addtogroup locale-api-import-export
 * @{
 */

/**
 * Generates a structured array of all strings with translations in
 * $language, if given. This array can be used to generate an export
 * of the string in the database.
 *
 * @param $language
 *   Language object to generate the output for, or NULL if generating
 *   translation template.
 * @param $group
 *   Text group to export PO file from (eg. 'default' for interface
 *   translations).
 */
function _locale_export_get_strings($language = NULL, $group = 'default') {
	if (isset($language)) {
		$result = db_query("SELECT s.lid, s.source, s.context, s.location, t.translation, t.plid, t.plural FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.textgroup = :textgroup ORDER BY t.plid, t.plural", array(':language' => $language->language, ':textgroup' => $group));
	}
	else {
		$result = db_query("SELECT s.lid, s.source, s.context, s.location, t.plid, t.plural FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid WHERE s.textgroup = :textgroup ORDER BY t.plid, t.plural", array(':textgroup' => $group));
	}
	$strings = array();
	foreach ($result as $child) {
		$string = array(
				'comment'     => $child->location,
				'source'      => $child->source,
				'context'     => $child->context,
				'translation' => isset($child->translation) ? $child->translation : '',
		);
		if ($child->plid) {
			// Has a parent lid. Since we process in the order of plids,
			// we already have the parent in the array, so we can add the
			// lid to the next plural version to it. This builds a linked
			// list of plurals.
			$string['child'] = TRUE;
			$strings[$child->plid]['plural'] = $child->lid;
		}
		$strings[$child->lid] = $string;
	}
	return $strings;
}

/**
 * Generates the PO(T) file contents for given strings.
 *
 * @param $language
 *   Language object to generate the output for, or NULL if generating
 *   translation template.
 * @param $strings
 *   Array of strings to export. See _locale_export_get_strings()
 *   on how it should be formatted.
 * @param $header
 *   The header portion to use for the output file. Defaults
 *   are provided for PO and POT files.
 */
function _locale_export_po_generate($language = NULL, $strings = array(), $header = NULL) {
	global $user;

	if (!isset($header)) {
		if (isset($language)) {
			$header = '# ' . $language->name . ' translation of ' . variable_get('site_name', 'Drupal') . "\n";
			$header .= '# Generated by ' . $user->name . ' <' . $user->mail . ">\n";
			$header .= "#\n";
			$header .= "msgid \"\"\n";
			$header .= "msgstr \"\"\n";
			$header .= "\"Project-Id-Version: PROJECT VERSION\\n\"\n";
			$header .= "\"POT-Creation-Date: " . date("Y-m-d H:iO") . "\\n\"\n";
			$header .= "\"PO-Revision-Date: " . date("Y-m-d H:iO") . "\\n\"\n";
			$header .= "\"Last-Translator: NAME <EMAIL@ADDRESS>\\n\"\n";
			$header .= "\"Language-Team: LANGUAGE <EMAIL@ADDRESS>\\n\"\n";
			$header .= "\"MIME-Version: 1.0\\n\"\n";
			$header .= "\"Content-Type: text/plain; charset=utf-8\\n\"\n";
			$header .= "\"Content-Transfer-Encoding: 8bit\\n\"\n";
			if ($language->formula && $language->plurals) {
				$header .= "\"Plural-Forms: nplurals=" . $language->plurals . "; plural=" . strtr($language->formula, array('$' => '')) . ";\\n\"\n";
			}
		}
		else {
			$header = "# LANGUAGE translation of PROJECT\n";
			$header .= "# Copyright (c) YEAR NAME <EMAIL@ADDRESS>\n";
			$header .= "#\n";
			$header .= "msgid \"\"\n";
			$header .= "msgstr \"\"\n";
			$header .= "\"Project-Id-Version: PROJECT VERSION\\n\"\n";
			$header .= "\"POT-Creation-Date: " . date("Y-m-d H:iO") . "\\n\"\n";
			$header .= "\"PO-Revision-Date: YYYY-mm-DD HH:MM+ZZZZ\\n\"\n";
			$header .= "\"Last-Translator: NAME <EMAIL@ADDRESS>\\n\"\n";
			$header .= "\"Language-Team: LANGUAGE <EMAIL@ADDRESS>\\n\"\n";
			$header .= "\"MIME-Version: 1.0\\n\"\n";
			$header .= "\"Content-Type: text/plain; charset=utf-8\\n\"\n";
			$header .= "\"Content-Transfer-Encoding: 8bit\\n\"\n";
			$header .= "\"Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;\\n\"\n";
		}
	}

	$output = $header . "\n";

	foreach ($strings as $lid => $string) {
		// Only process non-children, children are output below their parent.
		if (!isset($string['child'])) {
			if ($string['comment']) {
				$output .= '#: ' . $string['comment'] . "\n";
			}
			if (!empty($string['context'])) {
				$output .= 'msgctxt ' . _locale_export_string($string['context']);
			}
			$output .= 'msgid ' . _locale_export_string($string['source']);
			if (!empty($string['plural'])) {
				$plural = $string['plural'];
				$output .= 'msgid_plural ' . _locale_export_string($strings[$plural]['source']);
				if (isset($language)) {
					$translation = $string['translation'];
					for ($i = 0; $i < $language->plurals; $i++) {
						$output .= 'msgstr[' . $i . '] ' . _locale_export_string($translation);
						if ($plural) {
							$translation = _locale_export_remove_plural($strings[$plural]['translation']);
							$plural = isset($strings[$plural]['plural']) ? $strings[$plural]['plural'] : 0;
						}
						else {
							$translation = '';
						}
					}
				}
				else {
					$output .= 'msgstr[0] ""' . "\n";
					$output .= 'msgstr[1] ""' . "\n";
				}
			}
			else {
				$output .= 'msgstr ' . _locale_export_string($string['translation']);
			}
			$output .= "\n";
		}
	}
	return $output;
}

/**
 * Write a generated PO or POT file to the output.
 *
 * @param $language
 *   Language object to generate the output for, or NULL if generating
 *   translation template.
 * @param $output
 *   The PO(T) file to output as a string. See _locale_export_generate_po()
 *   on how it can be generated.
 */
function _locale_export_po($language = NULL, $output = NULL) {
	// Log the export event.
	if (isset($language)) {
		$filename = $language->language . '.po';
		watchdog('locale', 'Exported %locale translation file: %filename.', array('%locale' => $language->name, '%filename' => $filename));
	}
	else {
		$filename = 'drupal.pot';
		watchdog('locale', 'Exported translation file: %filename.', array('%filename' => $filename));
	}
	// Download the file for the client.
	header("Content-Disposition: attachment; filename=$filename");
	header("Content-Type: text/plain; charset=utf-8");
	print $output;
	drupal_exit();
}

/**
 * Print out a string on multiple lines
 */
function _locale_export_string($str) {
	$stri = addcslashes($str, "\0..\37\\\"");
	$parts = array();

	// Cut text into several lines
	while ($stri != "") {
		$i = strpos($stri, "\\n");
		if ($i === FALSE) {
			$curstr = $stri;
			$stri = "";
		}
		else {
			$curstr = substr($stri, 0, $i + 2);
			$stri = substr($stri, $i + 2);
		}
		$curparts = explode("\n", _locale_export_wrap($curstr, 70));
		$parts = array_merge($parts, $curparts);
	}

	// Multiline string
	if (count($parts) > 1) {
		return "\"\"\n\"" . implode("\"\n\"", $parts) . "\"\n";
	}
	// Single line string
	elseif (count($parts) == 1) {
		return "\"$parts[0]\"\n";
	}
	// No translation
	else {
		return "\"\"\n";
	}
}

/**
 * Custom word wrapping for Portable Object (Template) files.
 */
function _locale_export_wrap($str, $len) {
	$words = explode(' ', $str);
	$return = array();

	$cur = "";
	$nstr = 1;
	while (count($words)) {
		$word = array_shift($words);
		if ($nstr) {
			$cur = $word;
			$nstr = 0;
		}
		elseif (strlen("$cur $word") > $len) {
			$return[] = $cur . " ";
			$cur = $word;
		}
		else {
			$cur = "$cur $word";
		}
	}
	$return[] = $cur;

	return implode("\n", $return);
}

/**
 * Removes plural index information from a string
 */
function _locale_export_remove_plural($entry) {
	return preg_replace('/(@count)\[[0-9]\]/', '\\1', $entry);
}
/**
 * @} End of "locale-api-import-export"
 */

/**
 * @defgroup locale-api-seek Translation search API
 * @{
 * Functions to search in translation files.
 *
 * These functions provide the functionality to search for specific
 * translations.
 */

/**
 * Perform a string search and display results in a table
 */
function _locale_translate_seek() {
	$output = '';

	// We have at least one criterion to match
	if (!($query = _locale_translate_seek_query())) {
		$query = array(
				'translation' => 'all',
				'group' => 'all',
				'language' => 'all',
				'string' => '',
		);
	}

	$sql_query = db_select('locales_source', 's');
	$sql_query->leftJoin('locales_target', 't', 't.lid = s.lid');
	$sql_query->fields('s', array('source', 'location', 'context', 'lid', 'textgroup'));
	$sql_query->fields('t', array('translation', 'language'));

	// Compute LIKE section.
	switch ($query['translation']) {
		case 'translated':
			$sql_query->condition('t.translation', '%' . db_like($query['string']) . '%', 'LIKE');
			$sql_query->orderBy('t.translation', 'DESC');
			break;
		case 'untranslated':
			$sql_query->condition(db_and()
			->condition('s.source', '%' . db_like($query['string']) . '%', 'LIKE')
			->isNull('t.translation')
			);
			$sql_query->orderBy('s.source');
			break;
		case 'all' :
		default:
			$condition = db_or()
			->condition('s.source', '%' . db_like($query['string']) . '%', 'LIKE');
			if ($query['language'] != 'en') {
				// Only search in translations if the language is not forced to English.
				$condition->condition('t.translation', '%' . db_like($query['string']) . '%', 'LIKE');
			}
			$sql_query->condition($condition);
			break;
	}

	$limit_language = NULL;
	if ($query['language'] != 'en' && $query['language'] != 'all') {
		$sql_query->condition('language', $query['language']);
		$limit_language = $query['language'];
	}

	// Add a condition on the text group.
	if (!empty($query['group']) && $query['group'] != 'all') {
		$sql_query->condition('s.textgroup', $query['group']);
	}

	$sql_query = $sql_query->extend('PagerDefault')->limit(50);
	$locales = $sql_query->execute();

	$groups = module_invoke_all('locale', 'groups');
	$header = array(t('Text group'), t('String'), t('Context'), ($limit_language) ? t('Language') : t('Languages'), array('data' => t('Operations'), 'colspan' => '2'));

	$strings = array();
	foreach ($locales as $locale) {
		if (!isset($strings[$locale->lid])) {
			$strings[$locale->lid] = array(
					'group' => $locale->textgroup,
					'languages' => array(),
					'location' => $locale->location,
					'source' => $locale->source,
					'context' => $locale->context,
			);
		}
		if (isset($locale->language)) {
			$strings[$locale->lid]['languages'][$locale->language] = $locale->translation;
		}
	}

	$rows = array();
	foreach ($strings as $lid => $string) {
		$rows[] = array(
				$groups[$string['group']],
				array('data' => check_plain(truncate_utf8($string['source'], 150, FALSE, TRUE)) . '<br /><small>' . $string['location'] . '</small>'),
				$string['context'],
				array('data' => _locale_translate_language_list($string['languages'], $limit_language), 'align' => 'center'),
				array('data' => l(t('edit'), "admin/config/regional/translate/edit/$lid", array('query' => drupal_get_destination())), 'class' => array('nowrap')),
				array('data' => l(t('delete'), "admin/config/regional/translate/delete/$lid", array('query' => drupal_get_destination())), 'class' => array('nowrap')),
		);
	}

	$output .= theme('table', array('header' => $header, 'rows' => $rows, 'empty' => t('No strings available.')));
	$output .= theme('pager');

	return $output;
}

/**
 * Build array out of search criteria specified in request variables
 */
function _locale_translate_seek_query() {
	$query = &drupal_static(__FUNCTION__);
	if (!isset($query)) {
		$query = array();
		$fields = array('string', 'language', 'translation', 'group');
		foreach ($fields as $field) {
			if (isset($_SESSION['locale_translation_filter'][$field])) {
				$query[$field] = $_SESSION['locale_translation_filter'][$field];
			}
		}
	}
	return $query;
}

/**
 * Force the JavaScript translation file(s) to be refreshed.
 *
 * This function sets a refresh flag for a specified language, or all
 * languages except English, if none specified. JavaScript translation
 * files are rebuilt (with locale_update_js_files()) the next time a
 * request is served in that language.
 *
 * @param $langcode
 *   The language code for which the file needs to be refreshed.
 *
 * @return
 *   New content of the 'javascript_parsed' variable.
 */
function _locale_invalidate_js($langcode = NULL) {
	$parsed = variable_get('javascript_parsed', array());

	if (empty($langcode)) {
		// Invalidate all languages.
		$languages = language_list();
		unset($languages['en']);
		foreach ($languages as $lcode => $data) {
			$parsed['refresh:' . $lcode] = 'waiting';
		}
	}
	else {
		// Invalidate single language.
		$parsed['refresh:' . $langcode] = 'waiting';
	}

	variable_set('javascript_parsed', $parsed);
	return $parsed;
}

/**
 * (Re-)Creates the JavaScript translation file for a language.
 *
 * @param $language
 *   The language, the translation file should be (re)created for.
 */
function _locale_rebuild_js($langcode = NULL) {
	if (!isset($langcode)) {
		global $language;
	}
	else {
		// Get information about the locale.
		$languages = language_list();
		$language = $languages[$langcode];
	}

	// Construct the array for JavaScript translations.
	// Only add strings with a translation to the translations array.
	$result = db_query("SELECT s.lid, s.source, s.context, t.translation FROM {locales_source} s INNER JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.location LIKE '%.js%' AND s.textgroup = :textgroup", array(':language' => $language->language, ':textgroup' => 'default'));

	$translations = array();
	foreach ($result as $data) {
		$translations[$data->context][$data->source] = $data->translation;
	}

	// Construct the JavaScript file, if there are translations.
	$data_hash = NULL;
	$data = $status = '';
	if (!empty($translations)) {

		$data = "Drupal.locale = { ";

		if (!empty($language->formula)) {
			$data .= "'pluralFormula': function (\$n) { return Number({$language->formula}); }, ";
		}

		$data .= "'strings': " . drupal_json_encode($translations) . " };";
		$data_hash = drupal_hash_base64($data);
	}

	// Construct the filepath where JS translation files are stored.
	// There is (on purpose) no front end to edit that variable.
	$dir = 'public://' . variable_get('locale_js_directory', 'languages');

	// Delete old file, if we have no translations anymore, or a different file to be saved.
	$changed_hash = $language->javascript != $data_hash;
	if (!empty($language->javascript) && (!$data || $changed_hash)) {
		file_unmanaged_delete($dir . '/' . $language->language . '_' . $language->javascript . '.js');
		$language->javascript = '';
		$status = 'deleted';
	}

	// Only create a new file if the content has changed or the original file got
	// lost.
	$dest = $dir . '/' . $language->language . '_' . $data_hash . '.js';
	if ($data && ($changed_hash || !file_exists($dest))) {
		// Ensure that the directory exists and is writable, if possible.
		file_prepare_directory($dir, FILE_CREATE_DIRECTORY);

		// Save the file.
		if (file_unmanaged_save_data($data, $dest)) {
			$language->javascript = $data_hash;
			// If we deleted a previous version of the file and we replace it with a
			// new one we have an update.
			if ($status == 'deleted') {
				$status = 'updated';
			}
			// If the file did not exist previously and the data has changed we have
			// a fresh creation.
			elseif ($changed_hash) {
				$status = 'created';
			}
			// If the data hash is unchanged the translation was lost and has to be
			// rebuilt.
			else {
				$status = 'rebuilt';
			}
		}
		else {
			$language->javascript = '';
			$status = 'error';
		}
	}

	// Save the new JavaScript hash (or an empty value if the file just got
	// deleted). Act only if some operation was executed that changed the hash
	// code.
	if ($status && $changed_hash) {
		db_update('languages')
		->fields(array(
				'javascript' => $language->javascript,
		))
		->condition('language', $language->language)
		->execute();

		// Update the default language variable if the default language has been altered.
		// This is necessary to keep the variable consistent with the database
		// version of the language and to prevent checking against an outdated hash.
		$default_langcode = language_default('language');
		if ($default_langcode == $language->language) {
			$default = db_query("SELECT * FROM {languages} WHERE language = :language", array(':language' => $default_langcode))->fetchObject();
			variable_set('language_default', $default);
		}
	}

	// Log the operation and return success flag.
	switch ($status) {
		case 'updated':
			watchdog('locale', 'Updated JavaScript translation file for the language %language.', array('%language' => t($language->name)));
			return TRUE;
		case 'rebuilt':
			watchdog('locale', 'JavaScript translation file %file.js was lost.', array('%file' => $language->javascript), WATCHDOG_WARNING);
			// Proceed to the 'created' case as the JavaScript translation file has
			// been created again.
		case 'created':
			watchdog('locale', 'Created JavaScript translation file for the language %language.', array('%language' => t($language->name)));
			return TRUE;
		case 'deleted':
			watchdog('locale', 'Removed JavaScript translation file for the language %language, because no translations currently exist for that language.', array('%language' => t($language->name)));
			return TRUE;
		case 'error':
			watchdog('locale', 'An error occurred during creation of the JavaScript translation file for the language %language.', array('%language' => t($language->name)), WATCHDOG_ERROR);
			return FALSE;
		default:
			// No operation needed.
			return TRUE;
	}
}

/**
 * List languages in search result table
 */
function _locale_translate_language_list($translation, $limit_language) {
	// Add CSS.
	drupal_add_css(drupal_get_path('module', 'locale') . '/locale.css');

	$languages = language_list();
	unset($languages['en']);
	$output = '';
	foreach ($languages as $langcode => $language) {
		if (!$limit_language || $limit_language == $langcode) {
			$output .= (!empty($translation[$langcode])) ? $langcode . ' ' : "<em class=\"locale-untranslated\">$langcode</em> ";
		}
	}

	return $output;
}
/**
 * @} End of "locale-api-seek"
 */

/**
 * @defgroup locale-api-predefined List of predefined languages
 * @{
 * API to provide a list of predefined languages.
 */

/**
 * Prepares the language code list for a select form item with only the unsupported ones
 */
function _locale_prepare_predefined_list() {
	include_once DRUPAL_ROOT . '/includes/iso.inc';
	$languages = language_list();
	$predefined = _locale_get_predefined_list();
	foreach ($predefined as $key => $value) {
		if (isset($languages[$key])) {
			unset($predefined[$key]);
			continue;
		}
		// Include native name in output, if possible
		if (count($value) > 1) {
			$tname = t($value[0]);
			$predefined[$key] = ($tname == $value[1]) ? $tname : "$tname ($value[1])";
		}
		else {
			$predefined[$key] = t($value[0]);
		}
	}
	asort($predefined);
	return $predefined;
}

/**
 * @} End of "locale-api-languages-predefined"
 */

/**
 * @defgroup locale-autoimport Automatic interface translation import
 * @{
 * Functions to create batches for importing translations.
 *
 * These functions can be used to import translations for installed
 * modules.
 */

/**
 * Prepare a batch to import translations for all enabled
 * modules in a given language.
 *
 * @param $langcode
 *   Language code to import translations for.
 * @param $finished
 *   Optional finished callback for the batch.
 * @param $skip
 *   Array of component names to skip. Used in the installer for the
 *   second pass import, when most components are already imported.
 *
 * @return
 *   A batch structure or FALSE if no files found.
 */
function locale_batch_by_language($langcode, $finished = NULL, $skip = array()) {
	// Collect all files to import for all enabled modules and themes.
	$files = array();
	$components = array();
	$query = db_select('system', 's');
	$query->fields('s', array('name', 'filename'));
	$query->condition('s.status', 1);
	if (count($skip)) {
		$query->condition('name', $skip, 'NOT IN');
	}
	$result = $query->execute();
	foreach ($result as $component) {
		// Collect all files for all components, names as $langcode.po or
		// with names ending with $langcode.po. This allows for filenames
		// like node-module.de.po to let translators use small files and
		// be able to import in smaller chunks.
		$files = array_merge($files, file_scan_directory(dirname($component->filename) . '/translations', '/(^|\.)' . $langcode . '\.po$/', array('recurse' => FALSE)));
		$components[] = $component->name;
	}

	return _locale_batch_build($files, $finished, $components);
}

/**
 * Prepare a batch to run when installing modules or enabling themes.
 *
 * This batch will import translations for the newly added components
 * in all the languages already set up on the site.
 *
 * @param $components
 *   An array of component (theme and/or module) names to import
 *   translations for.
 * @param $finished
 *   Optional finished callback for the batch.
 */
function locale_batch_by_component($components, $finished = '_locale_batch_system_finished') {
	$files = array();
	$languages = language_list('enabled');
	unset($languages[1]['en']);
	if (count($languages[1])) {
		$language_list = join('|', array_keys($languages[1]));
		// Collect all files to import for all $components.
		$result = db_query("SELECT name, filename FROM {system} WHERE status = 1");
		foreach ($result as $component) {
			if (in_array($component->name, $components)) {
				// Collect all files for this component in all enabled languages, named
				// as $langcode.po or with names ending with $langcode.po. This allows
				// for filenames like node-module.de.po to let translators use small
				// files and be able to import in smaller chunks.
				$files = array_merge($files, file_scan_directory(dirname($component->filename) . '/translations', '/(^|\.)(' . $language_list . ')\.po$/', array('recurse' => FALSE)));
			}
		}
		return _locale_batch_build($files, $finished);
	}
	return FALSE;
}

/**
 * Build a locale batch from an array of files.
 *
 * @param $files
 *   Array of files to import.
 * @param $finished
 *   Optional finished callback for the batch.
 * @param $components
 *   Optional list of component names the batch covers. Used in the installer.
 *
 * @return
 *   A batch structure.
 */
function _locale_batch_build($files, $finished = NULL, $components = array()) {
	$t = get_t();
	if (count($files)) {
		$operations = array();
		foreach ($files as $file) {
			// We call _locale_batch_import for every batch operation.
			$operations[] = array('_locale_batch_import', array($file->uri));
		}
		$batch = array(
				'operations'    => $operations,
				'title'         => $t('Importing interface translations'),
				'init_message'  => $t('Starting import'),
				'error_message' => $t('Error importing interface translations'),
				'file'          => 'includes/locale.inc',
				// This is not a batch API construct, but data passed along to the
				// installer, so we know what did we import already.
				'#components'   => $components,
		);
		if (isset($finished)) {
			$batch['finished'] = $finished;
		}
		return $batch;
	}
	return FALSE;
}

/**
 * Perform interface translation import as a batch step.
 *
 * @param $filepath
 *   Path to a file to import.
 * @param $results
 *   Contains a list of files imported.
 */
function _locale_batch_import($filepath, &$context) {
	// The filename is either {langcode}.po or {prefix}.{langcode}.po, so
	// we can extract the language code to use for the import from the end.
	if (preg_match('!(/|\.)([^\./]+)\.po$!', $filepath, $langcode)) {
		$file = (object) array('filename' => drupal_basename($filepath), 'uri' => $filepath);
		_locale_import_read_po('db-store', $file, LOCALE_IMPORT_KEEP, $langcode[2]);
		$context['results'][] = $filepath;
	}
}

/**
 * Finished callback of system page locale import batch.
 * Inform the user of translation files imported.
 */
function _locale_batch_system_finished($success, $results) {
	if ($success) {
		drupal_set_message(format_plural(count($results), 'One translation file imported for the newly installed modules.', '@count translation files imported for the newly installed modules.'));
	}
}

/**
 * Finished callback of language addition locale import batch.
 * Inform the user of translation files imported.
 */
function _locale_batch_language_finished($success, $results) {
	if ($success) {
		drupal_set_message(format_plural(count($results), 'One translation file imported for the enabled modules.', '@count translation files imported for the enabled modules.'));
	}
}

/**
 * @} End of "locale-autoimport"
 */

/**
 * Get list of all predefined and custom countries.
 *
 * @return
 *   An array of all country code => country name pairs.
 */
function country_get_list() {
	include_once DRUPAL_ROOT . '/includes/iso.inc';
	$countries = _country_get_predefined_list();
	// Allow other modules to modify the country list.
	drupal_alter('countries', $countries);
	return $countries;
}

/**
 * Save locale specific date formats to the database.
 *
 * @param $langcode
 *   Language code, can be 2 characters, e.g. 'en' or 5 characters, e.g.
 *   'en-CA'.
 * @param $type
 *   Date format type, e.g. 'short', 'medium'.
 * @param $format
 *   The date format string.
 */
function locale_date_format_save($langcode, $type, $format) {
	$locale_format = array();
	$locale_format['language'] = $langcode;
	$locale_format['type'] = $type;
	$locale_format['format'] = $format;

	$is_existing = (bool) db_query_range('SELECT 1 FROM {date_format_locale} WHERE language = :langcode AND type = :type', 0, 1, array(':langcode' => $langcode, ':type' => $type))->fetchField();
	if ($is_existing) {
		$keys = array('type', 'language');
		drupal_write_record('date_format_locale', $locale_format, $keys);
	}
	else {
		drupal_write_record('date_format_locale', $locale_format);
	}
}

/**
 * Select locale date format details from database.
 *
 * @param $languages
 *   An array of language codes.
 *
 * @return
 *   An array of date formats.
 */
function locale_get_localized_date_format($languages) {
	$formats = array();

	// Get list of different format types.
	$format_types = system_get_date_types();
	$short_default = variable_get('date_format_short', 'm/d/Y - H:i');

	// Loop through each language until we find one with some date formats
	// configured.
	foreach ($languages as $language) {
		$date_formats = system_date_format_locale($language);
		if (!empty($date_formats)) {
			// We have locale-specific date formats, so check for their types. If
			// we're missing a type, use the default setting instead.
			foreach ($format_types as $type => $type_info) {
				// If format exists for this language, use it.
				if (!empty($date_formats[$type])) {
					$formats['date_format_' . $type] = $date_formats[$type];
				}
				// Otherwise get default variable setting. If this is not set, default
				// to the short format.
				else {
					$formats['date_format_' . $type] = variable_get('date_format_' . $type, $short_default);
				}
			}

			// Return on the first match.
			return $formats;
		}
	}

	// No locale specific formats found, so use defaults.
	$system_types = array('short', 'medium', 'long');
	// Handle system types separately as they have defaults if no variable exists.
	$formats['date_format_short'] = $short_default;
	$formats['date_format_medium'] = variable_get('date_format_medium', 'D, m/d/Y - H:i');
	$formats['date_format_long'] = variable_get('date_format_long', 'l, F j, Y - H:i');

	// For non-system types, get the default setting, otherwise use the short
	// format.
	foreach ($format_types as $type => $type_info) {
		if (!in_array($type, $system_types)) {
			$formats['date_format_' . $type] = variable_get('date_format_' . $type, $short_default);
		}
	}

	return $formats;
}
